If you have an IOS app that says it will work with an ELM327 adapter, then buy an ELM327. The reason you're finding the ELM327's are saying they are Android-only is that's because the CD of sketchy software (and likely virus straight from China) that comes with the adapter is made for Android.
I'll caution you on this though. Not all ELM327's are equal. I bought one of those cheapie transparent-blue miniELM327 that are so common, and while it works on my Chrysler 300 and Dodge Magnum, it would not read my LS1-swapped '97 Suburban, nor my '06 Silverado SS. Would not connect. I spent just a few bucks more and got a BAFX Products ELM327 and it works like a champ on the Mopars and the SS. Check ebay seller expeneon - that's the real BAFX, there seem to be clones of it out there and I wouldn't risk it.
Richard